On 11/29/2013 10:09 AM, Denny Esterline wrote:
> So, I'm down to software. Try as I might, I can't imagine a scenario wher=
e
> software can destroy the FET drivers - The FETs sure, a little
> shoot-through will let the smoke out. But just the driver? And the
FETs are
> fine...

Check for negative voltage spikes on VS of the gate driver. I assume
this is a boot-strapping charge pump sort of driver. If your dV/dt is
extremely high you can get very quick negative-going spikes that can
send the gate driver into latch-up. This could prevent the low side from
turning off, while possibly still allowing the high side to turn on.

With that said, the bootstrapping gate driver chips are a lot better now
than they were even a few years ago, so this seems unlikely if you're
using state of the art - parts.

-
Martin

--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.